ElectrostaticAssembly of a Titanium Dioxide@HydrophilicPoly(phenylene sulfide) Porous Membrane with Enhanced Wetting Selectivityfor Separation of Strongly Corrosive Oil–Water Emulsions

The efficient treatment of oil–water emulsions in extreme environments, such as strongly acidic and alkaline media, remains a widespread concern. Poly(phenylene sulfide) (PPS)-based porous membranes with excellent resistance to chemicals and solvents are promising for settling this challenge. However, the limited hydrophilicity and the poor hydrated ability of the hydrophilic PPS (h-PPS) membranes reported in the literature prevents them from separating oil–water emulsions with high efficiency, large fluxes, and good antifouling performances. In this study, a firm rough TiO2 layer is constructed on a h-PPS membrane via electrostatic assembly to improve the surface hydrophilization. The introduction of the TiO2 layer increases the wetting selectivity and decreases the oil adhesion, which makes it capable to efficiently treat oil-in-water emulsions (efficiency > 98%). Most importantly, the underwater critical oil intrusion pressure almost doubled after the incorporation of the TiO2 layer, which allows the m...